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Mortazavi, M. and Shareghi, A. and Ghiassi-Nejad, M. and Kavousi, A and Jafari Zadeh, M. and Nazeri, F. and Mozdarani, Hossein. (2004) The need for national diagnostic reference levels: Entrance surface dose measurement in intraoral radiography. Iran. J. Radiat. Res, 2 (3).